### Whats added:

 * corrected logic fix and warn long Dot Qualified Expression and Safe Access Expression and Postfix Expression
 * added fix test in NewLineRuleFixTest
 * corrected and added warnings in NewLineRuleWarnTest
 * run diktat:fix@diktat

  ### Issue (#865)

diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt

@@ -544,8 +544,8 @@ fun ASTNode.leaveExactlyNumNewLines(num: Int) {
 }
 
 /**
- * If [whiteSpaceNode] is not null and has type [WHITE_SPACE], prepend a line break to it's text.
- * Otherwise, insert a new node with a line break before [beforeNode]
+ * If [whiteSpaceNode] is not null and has type [WHITE_SPACE] and this [WHITE_SPACE] contains 1 line, prepend a line break to it's text.
+ * If [whiteSpaceNode] is null or has`t type [WHITE_SPACE], insert a new node with a line break before [beforeNode]
  *
  * @param whiteSpaceNode a node that can possibly be modified
  * @param beforeNode a node before which a new WHITE_SPACE node will be inserted